The next day, Lu headed out into the sunshine with her friends near the Boston Marathon finish line; she never came back.

Boston University confirmed Wednesday that Lu, 23, who was from the northeastern Chinese city of Shenyang, was the third victim of the bombings and the last to be identified. The blasts also killed Martin Richard, 8, of Dorchester, and Krystle ­Campbell, 29, of Arlington.

Lu’s friends recalled her as a kind young woman with a passion for music who hoped to find love in America. She was enchanted by Boston — particularly the grandeur of spring — and recently wrote on Twitter, “I love the Charles River at night!”

Meixu said she first learned of Lu’s death from Chinese media reports. “I’m just really shocked,” she said.

Julio Cortez/Associated Press

A photograph of Boston University graduate student Lingzi Lu sat next to a message board outside the school’s Marsh Chapel on Wednesday.

In the chaos after the bombings, friends of Lingzi Lu had frantically posted to Facebook and Twitter that she was missing. They implored police and news outlets to help find her, sharing pictures of a young woman with piercing dark eyes, a sweet smile, and fingernails painted seafoam green.

Lu’s roommate reached out to BU’s Chinese Students and Scholars Association, and on Tuesday morning members took to the streets in hopes of finding her.

Yijing Lu, 21, who is also unrelated, drove from hospital to hospital until she reached Boston Medical Center, where staff members told her they were treating an unidentified Asian woman who was not stable enough for visitors.

Lingzi’s roommate and friends gathered to wait, only to discover, hours later, that the patient was not Lingzi. They were still sitting there when word came that Lingzi had died.

“Just silence,” Yijing said, of the moment the news came.

Lingzi’s roommate quietly told stories about her, Yijing said, murmuring about the food that Lingzi left in their refrigerator, unable to comprehend that her friend was dead.

Kaper said Lu enrolled at BU in fall 2012 after studying economics at the Beijing Institute of Technology. Earlier, she had attended Shenyang’s Northeast Yucai School.

On her Facebook page, Lu had created a photo gallery called “New Beginning in BU.”

She was an exceptional student, Kaper said. She was taking four courses this semester and would have only had one more class to go to complete her statistics degree. She had already begun looking for an internship.

The day Lu was killed, Kaper said, she put the finishing touches on a research project for a professional statistics conference.

“She’s
a very smart student, a very bright young scientist,” Kaper said. “It’s a tragic loss for us.”

Kaper said Lu was always bright and talkative, and was always in the company of a few of her close friends.

“She was really the spokesman of the group,” he said. “The word bubbly maybe is kind of a corny word, but, yeah, that’s what describes her.”

On Tuesday night, Kaper said, he faced the grim task of delivering the news to Lu’s close friends. “They were distraught. … There are just no words to describe this tragedy.”

Many of Lu’s friends declined to speak, saying they wanted to respect her family’s privacy.

Asked how the students in the department were coping, department administrator Kathleen Heavey said: “Some of them are okay. Some of them are beyond control right now.”

One of Lu’s friends with her at the Marathon, Zhou Danling, also a BU graduate student, was seriously injured in the blasts, the college said. She is in stable condition at Boston Medical Center. A third friend was unharmed.

During the morning, tributes to Lu had begun appearing at the base of a statue in front of BU’s Marsh Chapel: flowers, a pair of running sneakers, cards that promised never to forget.

Freshman Jiani Jiang, 19, of Chengdu, China, visited the makeshift memorial to pay her respects to Lu, who she did not know but whose death made her feel sad and far from home.

“There are a lot of foreign students who want to go home now,” she said.

Joy Liu, 23, a graduate student studying journalism at BU, left a green scally cap with a shamrock on it and a note reading “From Boston and Beijing with love, RIP.”

Liu, who is originally from Beijing and did not know Lu, said the tokens were meant to show how many people cared for her.

“I want her to know, it’s not only people from China that love her; people from Boston love her,” she said.

Travis Andersen and Kathleen Burge of the Globe staff and correspondent Katherine Landergan contributed to this report. Evan Allen can be reached at evan.allen@globe.com. Follow her on Twitter @Evanmallen